April 30th 2021
Due to recent spring weather conditions, after April frosts delayed or killed other plants - weeds including Japanese knotweed could spring up and 'dominate'.
Fallopia japonica - is the botanical name for Japanese knotweed and this invasive species spreads rapidly and is hard to remove due to its hardy rhizomes. Even remaining fragments can produce new growth.
Defra hosts a useful PDF guide produced by NNSS on how to identify Japanese knotweed: https://secure.fera.defra.gov.uk/nonnativespecies/downloadDocument.cfm?id=369
To read more: https://www.telegraph.co.uk/news/2021/04/23/japanese-knotweed-dominate-gardens-summer-april-frosts/